Experimental and simulation study on blast loads of cylindrical Shells

Abstract

Public buildings that house large populations are easy targets for terrorist attacks, the primary issue of architectural blast-resistant design is how to get blast loads on the surface of structures, and the shapes of blast waves and buildings both have important effects on it. In this paper, experiments and numerical simulations were carried out on blast loads on the surface of the cylindrical shell. blast loads, detonation products, and blast waves were well recorded and simulated, blast loads at the edge of cylindrical shells were attenuated by about 75%, and vortex rings were accidentally photographed nearby. blast loads are much affected by the location of the detonation point, charge shape, and charge size. The original shape of structures rather than deformation determines the distribution of blast loads, the air viscosity also needs to be scaled when using a scaled model to test blast loads. Experimental and simulation methods can offer a reference for building a standard database of blast loads.

Blast loads and variability on cylindrical shells under different charge orientations

“…5 b), finally, the reflected wave collides with the secondary shock wave (Fig. 5 c) to form a high-pressure area and bounce back 15 , 34 , 35 , the two waves seem to remain in their original trajectories without interference (Fig. 5 d).…”

“…9 a,b), the material parameter, specific simulation methods, and verification can be found in ref. 15 .

Figure 9 2D result mapping (adapted from Ref.

…”

“…9a,b), the material parameter, specific simulation methods, and verification can be found in ref. 15 . The 2D result remapping affected by ground reflection can not be used for other cases except for Case 1, for Case 3, the gradient grid method is first adopted (Fig.…”

“…However, the representation method of scaled distance in the empirical formula defaults to the blast waves as spherical waves, For the real scene of bomb attacks, the blast waves in near-field blasts which poses a great threat to buildings are usually non-spherical 13 , owing to the shape of charges, even spherical charges are difficult to detonate symmetrically in actual tests 14 . The load variability caused by ignoring the directionality of blast waves is not clear.The geometric shape of buildings also has an important impact on blast loads [15][16][17][18] , there is no detailed test data on blast loads of cylindrical shells 19 , and the test data in near-field blasts is very scarce, owing to traditional gauges can not withstand such a large pressure and high temperature of the flame 20 , and it also limited by the number of gauges. Therefore, the complex propagation of blast waves was recorded by high-speed photography techniques to facilitate the analysis of blast loads, and the accuracy of the numerical model is fully verified.In this paper, the influence of detailed factors such as charge shape and detonation configuration 13,[21][22][23] was also considered, and the object of blast loads was selected as the cylindrical shell with less test data 24 .…”

“…The geometric shape of buildings also has an important impact on blast loads [15][16][17][18] , there is no detailed test data on blast loads of cylindrical shells 19 , and the test data in near-field blasts is very scarce, owing to traditional gauges can not withstand such a large pressure and high temperature of the flame 20 , and it also limited by the number of gauges. Therefore, the complex propagation of blast waves was recorded by high-speed photography techniques to facilitate the analysis of blast loads, and the accuracy of the numerical model is fully verified.…”